The y-axis labels get their bottoms cut off. You can see this in the sample:
[url]http://www.dhtmlx.com/docs/products/dhtmlxChart/samples/06_bar_chart/08_horizonal_stacked_bars.html[/url]
Notice how the years 2007, 2008, 2009 are partially cut off.
I have this same problem in the horizontal stacked bar chart I am trying to create.